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Node device, high-speed industrial communication system and communication method

A technology of node equipment and industrial control, applied in transmission systems, multi-carrier systems, multi-frequency code systems, etc., can solve the problems of increasing system installation costs, increasing additional expenses, and deteriorating synchronization accuracy, and achieves simple and mature implementation methods and improved Real-time, anti-frequency selective fading effect

Inactive Publication Date: 2019-09-17
北京神经元网络技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce data congestion, it is necessary to introduce switches for bridging, which will cause complex network topology and increase system installation costs
In the real-time industrial Ethernet system, the synchronization mechanism mainly uses IEEE1588 synchronization technology, and uses the physical layer to stamp the time stamp for synchronization. The synchronization accuracy of this synchronization method will be affected by the network topology, and sending the time stamp also increases the system overhead. The transmission distance of the system is short, and the transmission distance supported at the rate of 100Mbps is about 100 meters

Method used

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  • Node device, high-speed industrial communication system and communication method
  • Node device, high-speed industrial communication system and communication method
  • Node device, high-speed industrial communication system and communication method

Examples

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no. 1 example

[0063] figure 1 An example of a high-speed industrial communication system 100 according to the first embodiment of the present invention is shown, which will be described in detail below. like figure 1 As shown, the high-speed industrial communication system 100 includes: a bus 101 and a plurality of node devices 102 and 103, and the plurality of node devices 102 and 103 are connected to the bus. Compared with the high-speed industrial communication system of the prior art, in the high-speed industrial communication system 100 of the first embodiment of the present invention, multiple node devices communicate with each other through OFDM modulation, that is, through orthogonal frequency division multiplexing technology The modulated data is then sent to the bus 101 for data communication.

[0064] One of the improvements of the present invention is that, for example, using OFDM modulation method in the physical layer of the industrial control bus, the entire transmission ba...

no. 2 example

[0096] The second embodiment of the present invention relates to an industrial bus control method 200 . Control methods can be used to control e.g. figure 1 The industrial bus 101 shown, wherein a plurality of node devices 102 and / or 103 are connected on the industrial bus 101. Refer below Figure 7 The control method 200 is described in detail.

[0097] like Figure 7 As shown, when one of the node devices needs to send data,

[0098] In step S201: Modulate the data to be sent by using OFDM modulation.

[0099] Regarding the implementation of OFDM modulation of data, it is similar to the above reference Figure 5 The described content will not be repeated here.

[0100] In step S202: Send the modulated data to the industrial bus.

[0101] After the data is modulated by OFDM, the modulated data is sent to the industrial bus for data communication. Another node device as the other party of the data communication, after receiving the data, such as through Figure 5 The ...

no. 3 example

[0115] The third embodiment of the present invention relates to a node device 300 that can be connected to an industrial control bus, such as Figure 8 shown in detail below.

[0116] like Figure 8 As shown, the node device 300 includes a data transmission conversion module, and the data transmission conversion module can convert the data symbol stream to be transmitted. The data transmission conversion module includes a resource mapping unit 301 and an OFDM signal generating unit 302. Wherein, the resource mapping unit 301 can receive the pilot signal and the data symbol stream to be sent, and map the pilot signal and / or the data symbol stream to be sent to corresponding effective subcarriers. The OFDM signal generation unit 302 is configured to generate OFDM symbols from the pilot signal and / or the data symbol stream according to the effective subcarriers obtained by the resource mapping unit.

[0117] The physical layer of the present invention uses OFDM modulation tech...

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Abstract

The invention relates to a node device capable of being connected to an industrial control bus. The node device comprises a data sending conversion module which converts a to-be-sent data symbol stream, and the data sending conversion module comprises a resource mapping unit which can receive a pilot signal and the to-be-sent data symbol stream and map the to-be-sent data symbol stream to a corresponding effective subcarrier; and an OFDM signal generation unit which is used for generating OFDM symbols from the pilot signals and / or the data symbol streams according to the effective subcarriers obtained by the resource mapping unit. The invention also relates to a high-speed industrial communication system comprising the node device. The high-speed industrial communication system is mainly used for solving the problems that a traditional bus on an industrial site is low in bandwidth, real-time and non-real-time cannot be borne at the same time, and the network structure is complex. The high-speed industrial communication system can support IPV6 address communication, time-triggered industrial control communication, TSN and safety mechanisms such as a white list, deep detection and data encryption.

Description

technical field [0001] The present invention generally relates to the field of industrial control, and in particular to a node device, a high-speed industrial communication system and a communication method using OFDM modulation for communication. Background technique [0002] The existing industrial control bus is mainly divided into two types, one is the on-site industrial control bus represented by CAN bus, the main feature is the bus topology, that is, a pair of twisted pairs can connect multiple sensors and actuators. This network structure is convenient and simple to install. However, because the nodes of this topology are connected by a bus, the impedance of the nodes is not easy to match completely, and echo multipath will be introduced in the communication. Multipath reflection will make the communication channel appear as a frequency selective fading channel. Data communications can be seriously affected. The existing on-site industrial control bus represented by...

Claims

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Application Information

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IPC IPC(8): H04L12/40H04L1/00H04L27/26H04L27/36
CPCH04L1/004H04L1/0071H04L12/40006H04L27/2601H04L27/261H04L27/2627H04L27/362
Inventor 史兢康良川邵枝晖
Owner 北京神经元网络技术有限公司
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